A TI{KozakGAL4} DNA cassette has been inserted into CG31793, replacing the coding sequence (coordinates of deleted sequence are 2L:19003468..19008113 , release 6 genome). This results in a simultaneous knock-out of CG31793 plus a knock-in of GAL4 that is expected to be expressed under the control of the endogenous regulatory sequences of CG31793 (predicted to gene trap all annotated transcripts of the gene). The deletion also removes part of RpL30. The TI{KozakGAL4} cassette was inserted via the CRISPR/Cas-9 drop-in technique, using a dsDNA donor vector with homology arms of length 200bp. The sgRNA sequences used to target the gene were: ACAACGGAAAACTTTCCATTCGG and TATATTGGGCCCAATTGTAATGG.